Using string, a plastic straw, a balloon, a chair, and a doorknob, this ex-periment is set up as shown in the diagram at right.
The teacher blows up a large balloon for the children, holds the end so that the balloon does not deflate, and tapes it to a straw accord¬ing to the children's directions. The teacher lets go of the bal¬loon and it blasts off along the string. Marking the balloon's highest point on the string, the children measure the distance the balloon traveled using a full-size licorice stick.
Next, the teacher inflates and blasts a much smaller balloon. This time, however, the distance the balloon travels is measured with a very small piece of licorice. The children loudly protest when the small balloon's measurement indicates that it traveled farther than the large balloon. In puzzling over the apparent discrepancy in measure¬ment, children become more conscious of the importance of using a consis¬tent unit to measure.
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